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#include <arpa/inet.h>
#include <assert.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <zip.h>
#define MICO_HEADER "\211MiC\r\n\032\n"
zip_t *zip;
struct bitreader {
zip_file_t *input;
uint64_t bitbuf; // value of bits in write buffer
int bitcount; // number of bits in write buffer
int eof;
};
static uint64_t
getbits1_msb(struct bitreader *input, int count)
{
assert(count >= 1 && count <= 57);
// Keep reading extra bytes until we have enough bits buffered
// Big endian; our current bits are at the top of the word,
// new bits get added at the bottom.
while (input->bitcount < count) {
unsigned char buf;
int ret = zip_fread(input->input, &buf, sizeof buf);
if (ret < 0) {
printf("err: %s", zip_strerror(zip));
}
if (ret == 0) {
input->eof = 1;
return 0;
}
input->bitbuf |= (uint64_t)buf << (56 - input->bitcount);
input->bitcount += 8;
}
// We now have enough bits present; the most significant
// "count" bits in "bitbuf" are our result.
uint64_t result = input->bitbuf >> (64 - count);
// Now remove these bits from the buffer
input->bitbuf <<= count;
input->bitcount -= count;
return result;
}
static int32_t
getsigned(struct bitreader *input, int count)
{
uint64_t bits = getbits1_msb(input, count);
uint64_t sign = 1 << (count - 1);
if (bits & sign)
return -(bits ^ sign) - 1;
else
return bits;
}
static int64_t
get1(struct bitreader *input)
{
if (getbits1_msb(input, 1) == 0)
return 0;
if (getbits1_msb(input, 1) == 0)
return getsigned(input, 7);
if (getbits1_msb(input, 1) == 0)
return getsigned(input, 9);
if (getbits1_msb(input, 1) == 0)
return getsigned(input, 12);
int64_t v = getsigned(input, 32);
v <<= 32;
v |= getbits1_msb(input, 32);
return v;
}
#define ntohll(x) ((1==ntohl(1)) ? (x) : ((uint64_t)ntohl((x) & 0xFFFFFFFF) << 32) | ntohl((x) >> 32))
int
main(int argc, char *argv[])
{
if (argc < 2) {
fprintf(stderr, "usage: %s input.zip\n", argv[0]);
exit(-1);
}
zip = zip_open(argv[1], ZIP_RDONLY, 0);
int entries = zip_get_num_entries(zip, 0);
for (int i = 0; i < entries; i += 2) {
struct bitreader ts = { 0 };
struct bitreader vs = { 0 };
/* XXX verify assumptions on zip file order */
ts.input = zip_fopen_index(zip, i, 0);
vs.input = zip_fopen_index(zip, i+1, 0);
char *name = strdup(zip_get_name(zip, i, ZIP_FL_ENC_RAW));
char *s = strchr(name, '/');
*s = '{';
s = strrchr(name, '/');
*s++ = '}';
*s = 0;
char header[8];
uint64_t len, lenv;
int ret = zip_fread(ts.input, &header, sizeof header);
if (ret < 0) {
printf("err: %s", zip_strerror(zip));
}
if (memcmp(header, MICO_HEADER, 8) != 0) {
printf("wrong header\n");
continue;
}
ret = zip_fread(ts.input, &len, sizeof len);
if (ret < 0) {
printf("err: %s", zip_strerror(zip));
}
len = ntohll(len);
ret = zip_fread(vs.input, &header, sizeof header);
if (ret < 0) {
printf("err: %s", zip_strerror(zip));
}
if (memcmp(header, MICO_HEADER, 8) != 0) {
printf("wrong header\n");
continue;
}
ret = zip_fread(vs.input, &lenv, sizeof lenv);
if (ret < 0) {
printf("err: %s", zip_strerror(zip));
}
lenv = ntohll(lenv);
printf("len=%ld lenv=%d\n", len, lenv);
if (len != lenv) {
fprintf(stderr, "time and value length don't agree\n");
exit(-1);
}
int64_t t = 0, td = 0;
double v = 0.0;
for (uint64_t j = 0; j < len; j++) {
int64_t tdd = get1(&ts);
int64_t vd = get1(&vs);
td += tdd;
t += td;
v += vd;
printf("%s %f %ld\n", name, v/10000.0, t);
}
}
}
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